[WFLY-7516 WFLY-813] Upgrade Netty to 4.1.5.Final
[WFLY-7516 WFLY-813] Upgrade Netty to 4.1.5.Final

and netty-xnio-transport to 0.1.2.Final

JIRA: https://issues.jboss.org/browse/WFLY-7516
JIRA: https://issues.jboss.org/browse/WFLY-8113

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